cuirass vs gambeson

cuirass

noun
  • A piece of defensive armor, covering the body from the neck to the girdle. 

  • The breastplate taken by itself. 

verb
  • To cover with defensive armor; to armor-plate. 

gambeson

noun
  • A defensive garment formerly in use for the body, made of cloth stuffed and quilted, often worn as padding under armor. 

How often have the words cuirass and gambeson occurred in a corpus of books? (source: Google Ngram Viewer )